1. Qeraton Arabia – Harmonic Studies
Introduction
Qeraton Arabia offers specialized
and niche services that address
energy management, infrared
thermography, power system
studies and renewable energy
services.
Qeraton Arabia provide professional
services in the field of power system
studies including arc flash hazard
analysis, harmonics studies, short
circuit analysis, capacitor bank
switching study, protection
coordination study, transient
switching study etc.
Harmonic resonance by itself is not a problem. However, in the presence of
exciting harmonic current sources at resonant frequency, abnormally very
high harmonic voltages can build at various buses and results in amplified
harmonic current flows in the circuits causing several undesirable effects.
Qeraton Arabia provides complete solutions to your issues related to
harmonics in power systems.

2. Harmonics in Power System
Harmonics in power systems can result in
undesirable influence such as Capacitor
heating/failure, rotating equipment heating, Relay
mis-operation, Transformer heating, Switchgear
failure, Fuse blowing, Telephone interference. The
main sources of harmonics in power system are
static power converters, arc furnaces, discharge
lighting and any other load that requires non-
sinusoidal current. In order to limit the harmonic
current propagation in to the network, harmonic
filters are placed close to the source of the
harmonic currents
Qeraton Arabia services in Harmonic Studies are divided into two parts:
1) Harmonic Measurement
2) Harmonic Analysis

3. Harmonic Measurement
Qeraton Arabia team will measure harmonic distortion using three phase
power and harmonic analyzer. The analyzer can log all power quality
parameters including:
1) Voltage (V)
2) Current (I)
3) Active Power (kW)
4) Apparent Power (kVA)
5) Reactive Power (kVAR)
6) Power Factor (PF)
7) Harmonics distortions (Total harmonic
distortion as well as harmonics in different
components/orders)
8) Active Power Energy (kWh) and Reactive
power energy (KVARh)

4. Harmonic Analysis
The study team will perform the following additional analysis:
1. Driving point
impedance scans with the
suggested compensation
for the network
configurations considered
to identify the harmonic
resonance frequencies.
2. Using the design data
of harmonic currents from
various loads or
measurement data of harmonic currents, in specified format, study team will
perform Harmonic network solutions to estimate harmonic bus voltages. The
computed bus voltages will be used in computing the total harmonic voltage
distortion factors as per ANSI/IEEE Standard methods.
3. From the network solution of step 2, study team will also estimate the
conservative harmonic current flows through specified shunt compensation
and provide indications of over-sizing needed for the shunt reactive power
compensation to accommodate additional heating, power compensation
effect due to harmonic current flow through the shunt compensation.

5. Software Used for Analysis
The primary power system analysis tool for this project shall be the ETAP
software.
Deliverable
The deliverables from the harmonic studies includes:
 Harmonic driving point impedance plots at
various important buses of interest
 Individual harmonic and total harmonic
distortion factors and results of harmonic
analysis
 Detailed report with task (study) summary and
clear recommendations, followed by detailed
description of the study models, analysis, and
results. The software models of the project shall
be submitted together with the final report.

6. Applicable Standards
 IEEE Recommended Practice and Requirement for Harmonic Control in
Electrical Power Systems, IEEE Standard 519-1992, 1993
 IEEE Guide for application and specification of harmonic filters, IEEE
Standard 1573, 2003
 EN61000: Harmonic Current Emissions